Originally Posted by NoTempoLimitN54
Mike Miller is recommending 5k intervals for the N54. I think it will depend on your driving style and conditions (temperature, etc.). But I think 15k is too much unless you do mostly highway driving and live in in a warm climate where it rarely gets colder than 50º F.
Sounds about right...here are my results after an 8k mile run of RLI Bio-SynXtra HD 5w40: